Use random.choice to choose a value from the dictionary's value:
import random
TS_IDs = {
'69397': 30,
'10259': 30,
'87104': 30
}
def set_ts_id_random():
    ts_id_random = random.choice(list(TS_IDs.values()))
    print("random_ts_id:", ts_id_random)
    return ts_id_random
set_ts_id_random()
Output:
random_ts_id: 30
Remember, TS_IDs is a dict, not a list. It consist of key/value pairs. My code returns a random value, but if you'd rather have a random key, change ts_id_random = random.choice(list(TS_IDs.values())) to ts_id_random = random.choice(list(TS_IDs.keys())).